Also, is there any difference between animals in captivity and animals in the wild as regards menopause? For example, even if menopause has been observed in a captive member of a particular ape species, do individuals of that species typically live long enough in the wild to also undergo menopause?

I guess here's what I'm really getting at: is menopause a common thing in the animal kingdom, or is it only a common thing in humans?

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Yes. Menopause is common for long-lived mammals. For instance, in the wild, killer whales go in a sort of menopause as reported in 2009 by Ward et al. Front Zool. 2009 Feb 3;6:4. So it is not due to captivity. According to a Nature review, reproductive cessation has also been documented in non-human primates, rodents, whales, dogs, rabbits, elephants and domestic livestock (Packer et al. Nature. 1998; 392(6678):807-11)